Campbell Biology (11th Edition)

Chapter 41 - 41.4 - Concept Check - Page 912: 3

Answer

The lactase-producing bacteria would be unlikely to survive for long in the human digestive system.

Work Step by Step

For one, the temperature difference between yogurt (which is typically processed and stored cold) and the human gut is massive. Our digestive systems are also made to eliminate external bacteria that may come in through food through other inhospitable environmental elements such as high acidity.